JP2021164982A - Portable cutting machine - Google Patents

Abstract

To provide a portable cutting machine called a tip saw cutter, capable of more effectively preventing cutting powder from scattering, especially preventing such a case that the cutting powder of cutting material leaks from the front gap between the lower end of the front part of the dust collecting box and the base, where it may be assumed that the leaked cutting powder collides with the folded portion of the base and the like and scatters.SOLUTION: A shielding member 51 that closes a front gap 5 is attached by using a ruler attachment portion 15 for attaching a parallel ruler provided on a base 10. The shielding member 51 has substantially the same flat plate shape as legs of the parallel ruler. Like the parallel ruler, the shielding member 51 is inserted through a holding portion 16 and fixed by tightening a fixing screw 18. Cutting powder leaking from the front gap 5 is shielded by the shielding member 51 so as to be prevented from scattering.SELECTED DRAWING: Figure 9

Description

The present invention relates to a portable cutting machine that performs cutting processing by a worker holding it in his / her hand and performing a moving operation.

For example, a portable cutting machine for metalworkers, which is also called a tip saw cutter and uses a metal cutting tip saw as a cutting tool, is provided. A tip saw is a type of cutting blade in which a tip and a base metal are manufactured as separate parts and integrated with each other by welding. Conventionally, in a portable cutting machine for metal processing, various measures have been taken to efficiently collect sparks generated by the cutting process and chips generated by solidification of the sparks.

Patent Document 1 discloses a technique in which chips accumulated on the tooth bottom are smoothly guided to the dust collection box by appropriately setting the distance between the tooth tips and the like with respect to the inner wall of the fixed cover. .. Patent Document 2 discloses a technique in which a cutting machine for wood processing is provided with a skirt portion that covers a chip generating portion at a lower portion of a front cover main body to prevent chips from scattering to the outside. Patent Document 3 also discloses a technique in which a protrusion is provided on a slide cover provided at the front portion of a fixed cover in a cutting machine for wood processing, and the protrusion shields the upper part of the cut portion.

JP-A-2019-198912 Jikkenhei 5-5333 Gazette Japanese Unexamined Patent Publication No. 2002-18811

However, in the former technique disclosed in Patent Document 1, a slight gap is set between the base and the front portion of the fixed cover in order to avoid mutual interference. Chips may leak out through this gap, albeit in a small amount. It is assumed that the leaked chips will collide with the folded part of the base and scatter. In this respect, it was necessary to further enhance the effect of preventing the scattering of chips. According to the technique for wood processing disclosed in Patent Documents 2 and 3, a member having poor durability against chips including sparks is arranged inside the fixed cover, and therefore, for metal processing. It was difficult to apply to portable cutting machines. In contrast to these conventional techniques, it is necessary to further enhance the effect of preventing the scattering of cutting powder (chips) generated by the cutting process (dust collection efficiency) in the portable cutting machine for metalworking.

According to one feature of the present disclosure, a portable cutting machine comprises a base having a lower surface that is in contact with the cutting material and a cutting machine body supported on the upper surface side of the base. Further, the portable cutting machine has a front cover portion which is provided on the main body of the cutting machine and covers the front periphery of the disc-shaped cutting blade, and a ruler attachment portion provided on a base on which a parallel ruler can be detachably attached. .. Further, the portable cutting machine has a shielding member which is attached to a ruler attachment portion instead of a parallel ruler and covers a front gap formed between a front cover portion and a base.

Therefore, the attachment portion of the parallel ruler can be used to shield the cutting powder scattered from the front gap between the base and the front cover portion. This makes it possible to prevent the chips of the portable cutting machine from scattering more effectively. Since it is configured to be mounted using the mounting portion of the parallel ruler, a large cost increase can be avoided.

According to another feature of the present disclosure, the ruler attachment portion has a configuration in which the shielding member is detachable in the left-right direction where the shielding member intersects the cutting traveling direction. Therefore, a large space is not required for attachment / detachment. As a result, the handleability for attaching / detaching the shielding member is improved.

According to another feature of the present disclosure, the shielding member has a non-slip treated grip. Therefore, the shielding member can be attached and detached by gripping the grip portion. As a result, since the grip portion is treated to prevent slipping, the handleability for attaching / detaching the shielding member is improved.

According to another feature of the present disclosure, instead of the shielding member, a plate-shaped leg of a parallel ruler is attached to the ruler attachment portion. The legs cover the front gap between the front cover area and the base. Therefore, even when the legs of the parallel ruler are attached instead of the shielding member, the cutting powder scattered from the front gap is shielded by the legs of the parallel ruler.

According to another feature of the present disclosure, the shielding member has a guide portion for aligning the sumi lines. The guide portion is provided in a notch shape or is provided with a mark. Therefore, the shielding member can also be used as a guide portion for aligning the sumi lines. This facilitates the work of aligning the sumi lines.

According to another feature of the present disclosure, the shielding member has a rod-shaped main body portion and an auxiliary shielding portion that stands upward in front of the front gap from the main body portion. Therefore, for example, when the cutting depth of the cutting blade is reduced and the front gap expands upward, the auxiliary shielding portion prevents the cutting powder from leaking.

According to another feature of the present disclosure, the auxiliary shielding portion is formed of a leaf spring as a material and elastically abuts on the front cover portion. Therefore, for example, the auxiliary shielding portion is elastically displaced according to the expansion and contraction of the front gap due to the displacement of the front cover portion, so that the leakage of the cutting powder is efficiently prevented.

According to another feature of the present disclosure, the shielding member has a spatula-shaped point at the end. Therefore, the shielding member can be removed from the ruler attachment portion, and the sharp portion can be used as a spatula (scraper). For example, the shielding member can be used to scrape out the cutting powder accumulated in the dust collection box.

According to another feature of the present disclosure, the shielding member is provided with a dimensional scale. Therefore, the shielding member can be used as a ruler.

It is an overall perspective view of a portable cutting machine. This figure shows a state in which a parallel ruler is attached. It is an overall perspective view of a portable cutting machine. This figure shows the state where the parallel ruler is removed. FIG. 2 is a view taken along the line III in FIG. 2, which is a right side view of the portable cutting machine. FIG. 2 is a view taken along the line IV in FIG. 2 and is a plan view of a portable cutting machine. FIG. 2 is a view taken along the line V in FIG. 2, which is a left side view of the portable cutting machine. FIG. 2 is a view taken along the line VI and is a front view of the portable cutting machine. It is a VII arrow view in FIG. 2, and is a rear view of a portable cutting machine. It is a VIII arrow view in FIG. 2, and is a bottom view of a portable cutting machine. It is an overall perspective view of a portable cutting machine. This figure shows a state in which the shielding member according to the first embodiment is attached. It is a vertical cross-sectional enlarged view of the shielding member and its surroundings which concerns on 1st Embodiment. It is a perspective view of the shielding member which concerns on 1st Embodiment. It is a perspective view of the shielding member which concerns on 2nd Embodiment. It is the whole top view of the portable cutting machine which attached the shielding member which concerns on 2nd Embodiment. It is a perspective view of the shielding member which concerns on 3rd Embodiment. It is a vertical sectional view of the portable cutting machine which attached the shielding member which concerns on 3rd Embodiment. This figure shows a state in which the cutting depth is set to the maximum. It is an enlarged view of the XVI part in FIG. It is a vertical sectional view of the portable cutting machine which attached the shielding member which concerns on 3rd Embodiment. This figure shows a state in which the cutting depth is set to the minimum. FIG. 17 is an enlarged view of part XVIII in FIG. It is a perspective view of the shielding member which concerns on 4th Embodiment. It is a perspective view of the shielding member which concerns on 5th Embodiment.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 20. 1 to 8 show a portable cutting machine 1 common to each embodiment. In each of the embodiments described below, as the portable cutting machine 1, a cutting machine for metalwork, which is also called a tip saw cutter, will be exemplified. The portable cutting machine 1 includes a base 10 that comes into contact with the cutting material W, and a cutting machine main body 20 that is supported on the upper surface side of the base 10. The base 10 has a rectangular flat plate shape, and the lower surface side thereof is in contact with the upper surface of the cutting material W.

The cutting machine main body 20 includes an electric motor 21 as a drive source, a disk-shaped cutting blade 22, and a loop-shaped handle portion 23. As the electric motor 21, a brushless motor having a large output and compact in the motor axial direction is used. The electric motor 21 is housed in a cylindrical motor housing 21a.

The cutting blade 22 is formed by welding a large number of chips along the peripheral edge of a disk-shaped base metal at regular intervals in the circumferential direction, and a tip saw for cutting steel materials is used. ..

The range of approximately half the circumference of the upper side of the cutting blade 22 (the range on the upper surface side of the base 10) is covered with a part of the fixed cover 24 and the dust collection box 25. As shown in FIG. 4, the fixed cover 24 is hidden on the left side of the dust collection box 25. As shown in FIGS. 1 to 3, the front region of the cutting blade 22 located above the upper surface of the base 10 is covered with the front cover portion 25a forming the front region of the dust collection box 25. This prevents the cutting powder from scattering around.

A dust collecting box 25 is arranged side by side on the right side of the fixed cover 24. The cutting powder generated at the portion where the cutting blade 22 is cut into the cutting material W (cutting portion C) is blown upward and flows into the front cover portion 25a which is the front portion of the dust collecting box 25. The cutting powder blown up into the front cover portion 25a flows upward and backward and is collected in the dust collection box 25. The dust collection box 25 can be removed from the fixing cover 24 by loosening the fixing screw 26. A lid 29 for discharging the collected cut powder is provided at the rear portion of the dust collection box 25. By removing the dust collection box 25 and opening the lid 29, the cut powder collected inside can be discharged. This facilitates the maintenance work of the dust collection box 25.

As shown in FIGS. 1 to 3, an arrow 28 indicating the rotation direction of the cutting blade 22 is displayed on the right side surface of the dust collection box 25. Therefore, the cutting blade 22 rotates in the counterclockwise direction in FIG. Therefore, at the cutting portion C, the cutting powder is blown upward by the counterclockwise rotating wind generated by the rotation of the cutting blade 22. A part of the cutting powder blown up from the cutting portion C leaks obliquely forward and upward through the front gap 5 between the front cover portion 25a of the dust collection box 25 and the base 10. The treatment of the leaked cutting powder will be described later.

As shown in FIG. 8, the lower side of the cutting blade 22 protrudes toward the lower surface side through the long groove hole-shaped window portion 11 provided in the base 10. This protruding portion is cut into the cutting material W to perform cutting processing. As shown in FIGS. 3 and 5, the periphery (tooth tip) of the lower portion of the cutting blade 22 protruding toward the lower surface side of the base 10 is covered with the movable cover 30. The movable cover 30 is provided so that the tip of the tooth can be opened and closed by rotating around the vicinity of the center of rotation of the cutting blade 22. The movable cover 30 is relatively opened by moving the portable cutting machine 1 in the cutting traveling direction with its tip end in contact with the cutting material W. As shown in FIG. 8, the movable cover 30 is urged in the closing direction by a tension spring 30a interposed between the movable cover 30 and the fixed cover 24. The movable cover 30 prevents the cutting blade 22 from being exposed except when necessary.

As shown in FIGS. 4 to 7, an electric motor is coupled to the left side portion of the fixed cover 24 via a reduction gear portion 31. The reduction gear portion 31 has a configuration in which a gear train is housed in a cylindrical gear housing 31a. The rotational output of the electric motor 21 is decelerated by the reduction gear unit 31 and output to the output shaft. Although not visible in the figure, the output shaft protrudes into the fixed cover 24. A cutting blade 22 is attached to an output shaft protruding into the fixed cover 24. Fixing screws 22a for fixing the cutting blade 22 to the tip of the output shaft are shown in FIGS. 1 to 3.

A support arm portion 32 is integrally provided on the front portion of the gear housing 31a of the reduction gear portion 31. The support arm portion 32 extends forward. The front portion of the support arm portion 32 is coupled to the upper surface of the base 10 via the vertical swing support shaft 33. Two support wall portions 12 that stand up in parallel with each other are integrally provided on the upper surface of the front portion of the base 10. The front portion of the support arm portion 32 is sandwiched between the two support wall portions 12. The vertical swing support shaft 33 coaxially penetrates the support arm portion 32 and the two support wall portions 12. As a result, the cutting machine main body 20 is supported on the upper surface of the front portion of the base 10 so as to be swingable up and down via the vertical swing support shaft 33. By swinging the cutting machine main body 20 up and down with respect to the base 10, the amount of protrusion of the cutting blade 22 toward the lower surface side of the base 10 can be changed. By changing the amount of protrusion of the cutting blade 22 toward the lower surface side of the base 10, the cutting depth of the cutting blade 22 with respect to the cutting material W can be changed.

A loop-shaped handle portion 23 is provided above the reduction gear portion 31. A trigger type switch lever 23d is provided on the inner peripheral side of the handle portion 23. When the switch lever 23d is pulled upward with a fingertip, the main switch (not visible in the figure) built in the handle portion 23 is turned on. When the main switch is turned on, the electric motor 21 starts. When the pulling operation of the switch lever 23d is released, the main switch is turned off and the electric motor 21 is stopped.

A lock-off button 23e is provided on the upper portion of the handle portion 23. The lock-off buttons 23e are arranged on both sides of the handle portion 23. When the lock-off button 23e is released on either side, the lock-off state is released and the switch lever 23d can be pulled. Unless the lock-off button 23e is released, the pulling operation of the switch lever 23d is prohibited, and the careless activation operation not intended by the user is restricted. When the pulling operation of the switch lever 23d is released, the release operation of the lock-off button is canceled. Further, as shown in FIG. 6, the left and right lock-off buttons 23e have a cylindrical shape in a portion protruding from the handle portion 23 to the left and right, and the upper portion thereof faces the left and right outward with respect to the lower portion. It is notched and the upper part is formed in an inclined planar shape. Therefore, the surface of the tip of the fingertip of the user can be easily brought into contact with the inclined flat surface portion of the lock-off button 23e. Further, the left and right lock-off buttons 23e are integrated with each other by an intermediate portion thereof, and can be moved horizontally in the left-right direction. By pressing the inclined flat surface portion of the upper part of the lock-off button 23e, the user can move the lock-off button 23e in the left-right direction without feeling uncomfortable while applying a slight downward force without moving the lock-off button 23e horizontally in the left-right direction. Can be made to.

The front portion 23a of the handle portion 23 is coupled to the upper portion of the gear housing 31a. The front portion 23a of the handle portion 23 stands upward from the upper portion of the gear housing 31a. The grip portion 23b extends diagonally downward from the upper portion of the front portion 23a. A strap connecting portion 23c for connecting a tether strap or the like for fall prevention is provided at the rear portion of the grip portion 23b. The rear side of the grip portion 23b is coupled to the rear surface side of the gear housing 31a via the battery mounting portion 35. One battery pack 36 is attached to the lower surface side of the battery attachment portion 35.

The electric motor 21 operates using the electric power of the battery pack 36 attached to the battery mounting portion 35 as a power source. The battery pack 36 can be used repeatedly by removing it from the battery mounting portion 35 and charging it. As shown by the white arrows in FIG. 4, the battery pack 36 can be attached by sliding it to the right with respect to the battery mounting portion 35, and can be removed by sliding it to the left.

A controller accommodating portion 37 is provided between the electric motor 21 and the battery mounting portion 35. The controller accommodating portion 37 mainly accommodates a rectangular flat plate-shaped controller 38 having a control board for controlling the operation of the electric motor 21.

An illuminator 39 using an LED (light emitting diode) as a light source is provided in front of the reduction gear portion 31 and below the front portion 23a of the handle portion 23. The cutting portion C (the cutting portion of the cutting blade 22 with respect to the cutting material W) is brightly illuminated by the illuminating tool 39, and the cutting work in a dark place or the like is convenient. A guide portion 10b for aligning the sumi wires is provided at the front end portion of the base 10. By aligning the guide portion 10b with the Sumi line displayed on the upper surface of the cutting material W, the cutting blade 22 is indirectly aligned with the Sumi line. The lighting tool 39 brightly illuminates the vicinity of the guide portion 10b, thereby facilitating the alignment.

A lock lever 40 is projected from the front portion of the reduction gear portion 31. When the lock lever 40 is pushed in, the output shaft to which the cutting blade 22 is attached is locked so as not to rotate. This makes it convenient to replace the cutting tool.

A spanner holding portion 42 for holding an L-shaped hexagonal bar spanner 41 is provided on the front portion of the motor housing 21a. As shown in FIG. 5, one holding hole 23f is provided at the base of the handle portion 23. The hexagonal wrench 41 can be kept in the cutting machine main body 20 by inserting the tip of the hexagon wrench 41 into the holding hole 23f and elastically sandwiching and holding the rear end side of the hex wrench 41 in the spanner holding portion 42. .. The hexagon wrench 41 is used for tightening the fixing screw 22a of the cutting blade 22. Since the hexagon wrench 41 is always provided in the cutting machine main body 20, the cutting blade 22 can be quickly replaced.

As shown in FIG. 4, a swing position fixing mechanism 45 is provided between the rear portion of the fixing cover 24 and the base 10 in order to fix the vertical swing position of the cutting machine main body 20. The swing position fixing mechanism 45 includes an arc-shaped depth guide 46 provided on the upper surface of the base 10 and a fixing lever 47. The depth guide 46 is supported so as to be tiltable back and forth via the tilt support shaft 46a. A fixing screw 47a is coupled to the fixing lever 47. The fixing screw 47a is inserted into the guide groove of the depth guide 46 and screwed into the left side portion of the fixing cover 24. The downward tilting operation of the fixing lever 47 tightens the fixing screw 47a, and the upward tilting operation loosens the fixing screw 47a. The depth guide 46 is sandwiched by tightening the fixing screw 47a by tilting the fixing lever 47 downward. As a result, the vertical swing position of the cutting machine main body 20 with respect to the base 10 is fixed, and the cutting depth is fixed. By tilting the fixing lever 47 upward to loosen the fixing screw 47a, the vertical swing position of the cutting machine main body 20 can be changed and the cutting depth can be adjusted.

As shown in FIG. 1, a parallel ruler 2 can be attached to the front portion of the base 10. The parallel ruler 2 functions as a guide for cutting the cutting blade 22 in parallel along the side portion of the cutting material W. The parallel ruler 2 has a flat plate-shaped ruler body 3 and one leg 4 extending in the left-right direction.

The parallel ruler 2 is attached to a ruler attachment portion 15 provided at the front portion of the base 10. The ruler mounting portion 15 includes two holding portions 16 and one fixing portion 17. Wall portions 10a are provided on the left and right side portions of the base 10 in a folded shape upward. The left and right wall portions 10a mainly function as ribs for increasing the surface rigidity of the base 10. One holding portion 16 is provided on each of the left and right wall portions 10a. In the present embodiment, a holding portion 16 and a holding hole for holding the parallel ruler 2 with respect to the base 10 are formed. The holding portion 16 is formed in an L shape so as to straddle between the upper surface of the base 10 and the wall portion 10a.

The two support wall portions 12 described above are arranged between the left and right holding portions 16. A rectangular relief hole 12a is provided in the lower portion of the two support wall portions 12. The two relief holes 12a are arranged on the same line as the left and right holding portions 16. Therefore, as shown in FIG. 1, the leg portion 4 of the parallel ruler 2 is inserted between the left and right holding portions 16, and is also inserted into the two relief holes 12a.

A fixing portion 17 is provided between the support wall portion 12 on the left side and the holding portion 16 on the left side. The fixing portion 17 includes a pedestal portion 17a and a fixing screw 18. The pedestal portion 17a has a gate shape that straddles the upper surface of the base 10. A fixing screw 18 as a fixing member is screwed into the pedestal portion 17a. When the fixing screw 18 is tightened, it moves downward. The parallel ruler 2 is fixed by tightening the fixing screw 18 and pressing the tip thereof against the leg portion 4.

When the fixing screw 18 is loosened, the leg portion 4 can move in the left-right direction, and the position of the ruler main body 3 can be adjusted. By adjusting the position of the ruler body 3, the distance between the cutting blade 22 and the edge of the cutting material W is adjusted. Further, the parallel ruler 2 can be removed from the ruler mounting portion 15 by loosening the fixing screw 18 and moving the leg portion 4 to the right and pulling it out from the holding portion 16. FIG. 2 and below show a state in which the parallel ruler 2 is removed.

The portable cutting machine 1 according to the present embodiment is the cutting powder that blows up from the cutting portion C and is not blown into the front cover portion 25a of the dust collecting box 25, but is the front portion of the front cover portion 25a of the dust collecting box 25. It has a scattering prevention structure 50 for preventing scattering of cutting powder leaking forward through the front gap 5 between the lower end and the base 10. The shatterproof structure 50 of the present embodiment has a configuration in which a shielding member 51 described below is attached by using a ruler attaching portion 15 for attaching the parallel ruler 2.

9 and 10 show a portable cutting machine 1 to which the shielding member 51 according to the first embodiment is attached. FIG. 11 shows a shielding member 51 removed from the ruler mounting portion 15. The shielding member 51 is made of a metal material and has the same width and plate thickness as the legs 4 of the parallel ruler 2. The shielding member 51 has substantially the same length as the left and right width of the base 10. The shielding member 51 is attached to and removed from the ruler attachment portion 15 by moving the shielding member 51 in the left-right direction along the left-right direction. The shielding member 51 can be inserted and attached from either side of the right holding portion 16 or the left holding portion 16, and can be pulled out and removed. Further, the shielding member 51 can be attached and detached from either the left or right side by inverting the left and right sides or inverting the top and bottom surfaces. The shielding member 51 is inserted through the left and right holding portions 16 and the relief holes 12a, and is attached along the left and right width directions of the base 10. The shielding member 51 is fixed by tightening the fixing screw 18.

As shown in FIG. 10, the shielding member 51 attached to the ruler attachment portion 15 is located in front of the front gap 5 between the lower end of the front portion of the front cover portion 25a of the dust collection box 25 and the base 10. Therefore, the front gap 5 is closed by the shielding member 51. Therefore, the shielding member 51 prevents the cutting powder leaking forward through the front gap 5 from scattering.

As shown in FIG. 11, gripping portions 51a that have been knurled to prevent slipping are provided at both ends of the shielding member 51. The user can pick up the grip portion 51a, attach the shielding member 51 to the ruler attachment portion 15, and remove it. The handleability of the shielding member 51 is enhanced by the grip portion 51a that has been subjected to the anti-slip treatment. Instead of knurling, a rubber layer may be coated to form a non-slip portion.

According to the portable cutting machine 1 according to the first embodiment configured as described above, the ruler attachment portion 15 of the parallel ruler 2 is used between the base 10 and the front cover portion 25a of the dust collection box 25. The front gap 5 is closed by the shielding member 51. As a result, the cutting powder leaking from the front gap 5 is shielded and scattered forward. This makes it possible to prevent the portable cutting machine 1 from scattering chips more effectively.

Further, according to the example shatterproof structure 50, since the shielding member 51 is configured to be attached by using the ruler attaching portion 15 of the parallel ruler 2, a large cost increase can be avoided.

Further, the shielding member 51 is moved in the left-right direction intersecting the cutting traveling direction, attached to the ruler attachment portion 15, and removed. Therefore, it does not require a large space for installation and removal. This improves the ease of handling for attaching and detaching the shielding members 51 to 55.

Various changes can be made to the shielding member 51 according to the first embodiment illustrated above. FIG. 12 shows the shielding member 52 according to the second embodiment. The shielding member 52 has a configuration in which a guide portion 52a for positioning is added to the shielding member 51 according to the first embodiment. The guide portion 52a is provided by cutting a V-groove on the outer surface of the shielding member 51. FIG. 13 shows a portable cutting machine 1 in which the shielding member 51 according to the second embodiment is attached to the ruler attachment portion 15. As shown in the figure, the guide portion 52a of the shielding member 52 is aligned with the guide portion 10b for aligning the sumi lines. As a result, the guide portion 52a can be used as a guide portion for aligning the sumi lines. Since the guide portion 52a located closer to the cutting edge of the cutting blade 22 can be used as a guide portion for aligning the sumi lines, the cutting blade 22 can be aligned with the sumi lines more quickly and accurately.

FIG. 14 shows the shielding member 53 according to the third embodiment. The shielding member 53 includes a main body portion 53a and an auxiliary shielding portion 53b. The main body 53a has the same width and thickness as the legs 4 of the parallel ruler 2. As shown in the figure, in the third embodiment, the knurling (non-slip portion) for forming the left and right grip portions of the main body portion 53a is omitted. Further, in the main body portion 53a according to the third embodiment, the guide portion 52a according to the second embodiment is omitted. The shielding members 51 and 52 of the first and second embodiments can be used as they are as the main body 53a.

The auxiliary shielding portion 53b compensates for the lack of the shielding function of the main body portion 53a, and a leaf spring is used as the material. The auxiliary shielding member 53b is a member separate from the main body portion 53a, and both are not fixed to each other. The auxiliary shielding portion 53b has a base portion 53c located on the lower surface side of the main body portion 53a and an upright portion 53d that stands up from the rear portion of the base portion 53c. The upper part of the upright portion 53d is bent forward in an arc shape to form a sliding contact portion 53e.

15 to 18 show a portable cutting machine 1 in which the shielding member 53 according to the third embodiment is attached to the ruler attachment portion 15. The main body portion 53a and the auxiliary shielding portion 53b of the shielding member 53 are located in front of the front gap 5 between the front cover portion 25a of the dust collecting box 25 and the upper surface of the base 10. When the shielding member 53 is attached to the ruler mounting portion 15, the auxiliary shielding portion 53b is positioned at a portion that shields the front of the front gap 5, and the fixing screw 18 is tightened so that the auxiliary shielding portion 53b is attached to the portion. It is fixed. The auxiliary shielding portion 53b is fixed by tightening the fixing screw 18 so that the base portion 53c is sandwiched between the main body portion 53a and the base 10.

As shown in FIGS. 15 and 16, the upright portion 53d of the auxiliary shielding portion 53b is attached in a state of being substantially in contact with the front surface of the front cover portion 25a of the dust collection box 25. As a result, the front gap 5 is closed by the upright portion 53d of the auxiliary shielding portion 53b, and the leakage of cutting powder is efficiently prevented. FIGS. 17 and 18 show a state in which the cutting machine main body 20 is swung upward to reduce the cutting depth of the cutting blade 22. In this case, the front cover portion 25a of the dust collection box 25 has the vertical swing support shaft 33 and is displaced upward. Therefore, the lower end of the front cover portion 25a is separated from the base 10, and the front gap 5 is expanded upward. Even in this case, the standing portion 53d of the auxiliary shielding portion 53b is located in front of the front gap 5, and leakage of the cutting powder from the front gap 5 is prevented.

As shown in FIG. 18, when the cutting machine main body 20 is swung up and down around the vertical swing support shaft 33, the sliding contact portion 53e of the auxiliary shielding portion 53b is slidably contacted with the front surface of the fixed cover 24. Further, the sliding contact portion 53e is elastically pressed against the front surface of the fixed cover 24 by the spring force of the upright portion 53d, and the upright portion 53d is returned to the upright position by the elastic force. Therefore, regardless of the vertical swing position of the cutting machine main body 20, the front gap 5 is shielded by the auxiliary shielding portion 53b to prevent leakage of cutting powder.

19 and 20 show the shielding members 54 and 55 according to the fourth and fifth embodiments, which have been further modified. The shielding member 54 according to the fourth embodiment shown in FIG. 19 has a grip portion 54a on one side that has been knurled to prevent slipping, and a spatula-shaped pointed portion 54b is provided on the other side. When the shielding member 54 is removed from the ruler mounting portion 15, the shielding member 54 can be utilized as a scraper by the sharpened portion 54b. For example, when the dust collecting box 25 is removed from the fixed cover 24 and the cutting powder collected inside is discarded, the sharpened portion 54b of the shielding member 54 is inserted into the dust collecting box 25 to efficiently collect the accumulated cutting powder. It can be scraped off well.

A dimensional scale 55a is displayed on the shielding member 55 according to the fifth embodiment shown in FIG. The shielding member 55 according to the fifth embodiment can be used as a ruler when, for example, it is removed from the ruler attachment portion 15 and the dimensions of other parts are measured.

As illustrated above, the shielding members 51 to 55 are attached to the ruler attachment portion 15 to prevent the cutting powder from scattering. Further, the shielding members 54 and 55 according to the fourth and fifth embodiments can be removed from the ruler attachment portion 15 and used as a scraper or a ruler. When the shielding members 51 to 55 are removed from the ruler attaching portion 15 and the parallel ruler 2 is attached, the leg portion 4 functions as a shielding member. The cut powder leaking from the front gap 5 between the lower end of the front portion of the front cover portion 25a of the dust collection box 25 and the upper surface of the base 10 is shielded by the leg portion 4 to prevent its scattering.

Further changes can be made to the embodiments described above. For example, although the shielding members 51 to 55 having substantially the same width and thickness as the leg portion 4 of the parallel ruler 2 have been illustrated, a larger width and thickness can be provided within a range that allows the holding portion 16, the relief hole 12a, and the fixing portion 17 to pass through. It may be changed to a shielding member having a smaller width and thickness, or vice versa.

Further, a shielding member longer or shorter than the illustrated shielding members 51 to 55 can be applied. It suffices that the shielding member has a length that is positioned so as to straddle the holding portion 16 and the fixing portion 17 on at least one side and is located at least in front of the front gap 5.

Further, the shielding member may be made of resin. In this case, a heat resistant resin is more desirable. The shielding member is not limited to having a strip shape, and may be a round bar shape, a pipe shape, or a square lumber shape provided that the holding portion 16, the relief hole 12a, and the fixing portion 17 can be inserted. In this case, a semi-circular opening may be added to the holding portion 16 or the like so that the shielding member can be inserted therethrough.

When the support wall portion 12, which is the support portion of the cutting machine main body 20 with respect to the base 10, is located at a portion shifted back and forth from the illustrated portion, interference with the shielding member can be avoided. Can be omitted.

Further, although the ruler attachment portion 15 for attaching the parallel ruler 2 having one leg portion 4 is illustrated, the ruler for attaching the parallel ruler in the form of fixing the two parallel legs at the front portion and the rear portion of the base is illustrated. The shatterproof structure 50 exemplified for the mounting portion can be applied.

The knurling of the grip portion 51a, the guide portion 52a, the auxiliary shielding portion 53b, the sharpened portion 54b, and the dimensional scale 55a, which are ancillary functions of the illustrated shielding members 51 to 55, should be appropriately combined into one shielding member. Can be done.

Further, although the configuration in which the front portion of the cutting blade 22 is covered by the front portion (front cover portion 25a) of the dust collecting box 25 arranged side by side on the side portion of the fixed cover 24 is illustrated, for example, the dust collecting box is not provided. It is possible to apply the dust scattering prevention structure exemplified for the configuration in which the front portion of the fixed cover or another portion is used as the front cover portion to cover the periphery of the front portion of the cutting blade 22.

As the portable cutting machine 1, a cutting machine for metalwork, which is also called a tip saw cutter, has been exemplified, but a portable circular saw for cutting woodwork equipped with a normal saw blade or a rotating disk-shaped diamond wheel is provided as a cutting tool. It can be widely applied to other forms of portable cutting machines such as cutters.

1 ... Portable cutting machine (tipped saw cutter)
W ... Cutting material C ... Cutting site 2 ... Parallel ruler 3 ... Ruler body 4 ... Leg 5 ... Front gap 10 ... Base 10a ... Wall 10b ... Guide 11 ... Window 12 ... Support wall 12a ... Relief hole 15 ... Ruler mounting part 16 ... Holding part 17 ... Fixing part 17a ... Pedestal part 18 ... Fixing screw 20 ... Cutting machine body 21 ... Electric motor (brushless motor)
21a ... Motor housing 22 ... Cutting blade 22a ... Fixing screw 23 ... Handle part 23a ... Front part, 23b ... Grip part, 23c ... Strap joint part 23d ... Switch lever, 23e ... Lockoff button, 23f ... Holding hole 24 ... Fixed cover 25 ... Dust collection box 25a ... Front cover part 26 ... Fixing screw 28 ... Arrow 29 ... Lid part 30 ... Movable cover 30a ... Tension spring 31 ... Reduction gear part 31a ... Gear housing 32 ... Support arm part 33 ... Vertical swing support shaft 35 ... Battery mounting part 36 ... Battery pack 37 ... Controller housing 38 ... Controller 39 ... Lighting equipment 40 ... Lock lever 41 ... Hexagonal bar spanner 42 ... Spanner holding part 45 ... Swing position fixing mechanism 46 ... Depth guide 47 ... Fixed lever 47a ... Fixing screw 50 ... Scattering prevention structure 51 ... Shielding member (first embodiment)
51a ... Grip (knurled)
52 ... Shielding member (second embodiment)
52a ... Guide portion 53 ... Shielding member (third embodiment)
53a ... Main body, 53b ... Auxiliary shielding, 53c ... Base, 53d ... Standing, 53e ... Sliding contact 54 ... Shielding member (4th embodiment)
54a ... Grip portion, 54b ... Pointed portion 55 ... Shielding member (fifth embodiment)
55a ... Dimensional scale

Claims (9)

It ’s a portable cutting machine,
A base with a lower surface that comes into contact with the cutting material,
The cutting machine body supported on the upper surface side of the base and
A front cover portion provided on the main body of the cutting machine and covering the front circumference of the disc-shaped cutting blade, and a front cover portion.
A ruler mounting part provided on the base to which the parallel ruler can be detachably mounted,
A portable cutting machine having a shielding member attached to the ruler mounting portion instead of the parallel ruler and covering a front gap formed between the front cover portion and the base. The portable cutting machine according to claim 1, wherein the ruler attachment portion is a portable cutting machine having a configuration in which the shielding member is detachable in the left-right direction at which the shielding member intersects the cutting traveling direction. The portable cutting machine according to claim 1 or 2, wherein the shielding member is a portable cutting machine having a non-slip-treated grip portion. The portable cutting machine according to any one of claims 1 to 3, wherein instead of the shielding member, a plate-shaped leg portion of the parallel ruler is attached to the ruler attachment portion, and the leg portion is attached. A portable cutting machine that covers the front gap between the front cover portion and the base. The portable cutting machine according to any one of claims 1 to 4, wherein the shielding member is a portable cutting machine having a notch-shaped guide portion for aligning lines or a guide portion having a mark. The portable cutting machine according to any one of claims 1 to 5, wherein the shielding member includes a rod-shaped main body portion and an auxiliary shielding portion that stands upward in front of the front gap from the main body portion. A portable cutting machine to have. The portable cutting machine according to claim 6, wherein the auxiliary shielding portion is formed of a leaf spring as a material and elastically abuts on the front cover portion. The portable cutting machine according to any one of claims 1 to 7, wherein the shielding member is a portable cutting machine having a spatula-shaped pointed portion at an end. The portable cutting machine according to any one of claims 1 to 8, wherein the shielding member is provided with a dimensional scale.

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